class_docstr: Named entity.
class_docstr_tok: ["Named","entity","."]
code: def test_pos(self):
      s = pd.Series(
          ["Today is such a beautiful day", "São Paulo is a great city"]
      )
      pos_tagging = nlp.pos_tag(s)
      s_true = pd.Series(
          [
              [
                  ("Today", "NOUN", "NN", 0, 5),
                  ("is", "AUX", "VBZ", 6, 8),
                  ("such", "DET", "PDT", 9, 13),
                  ("a", "DET", "DT", 14, 15),
                  ("beautiful", "ADJ", "JJ", 16, 25),
                  ("day", "NOUN", "NN", 26, 29),
              ],
              [
                  ("São", "PROPN", "NNP", 0, 3),
                  ("Paulo", "PROPN", "NNP", 4, 9),
                  ("is", "AUX", "VBZ", 10, 12),
                  ("a", "DET", "DT", 13, 14),
                  ("great", "ADJ", "JJ", 15, 20),
                  ("city", "NOUN", "NN", 21, 25),
              ],
          ]
      )
  
      self.assertEqual(pos_tagging, s_true)
  
file_path: texthero/tests/test_nlp.py
imports: import pandas
  import numpy
  from texthero import nlp
  from .None import PandasTestCase
  import doctest
  import unittest
  import string
label_desc: Use image node_id 8 for calling the TestNLP obj's underlying member method code with example usage: obj.test_pos() without return types